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HANDS FREE-ECU CHASSIS ELECTRICAL 54A-423 PROBABLE CAUSES • Malfunction of steering wheel voice control switch • Malfunction of the clock spring • Damaged harness wires and connectors DIAGNOSIS PROCEDURE STEP 1. Check if the steering wheel audio remote Q: Is the check result normal? YES : Go to Step 2. NO : Perform the troubleshooting for the STEP 2. Check the steering wheel voice control Q: Is the check result normal? YES : Go to Step 3. NO : Replace the steering wheel voice control STEP 3. Connector check: C-312 steering wheel Q: Is the check result normal? YES : Go to Step 4. NO : Repair the defective connector. STEP 4. Check the wiring harness between C-312 • Check the earth wire for open circuit. Q: Is the check result normal? YES : Go to Step 5. NO : Repair the wiring harness. STEP 5. Connector check: C-310 clock spring Q: Is the check result normal? YES : Go to Step 6. NO : Repair the defective connector. STEP 6. Check the clock spring. − Air bag module and clock spring ). Q: Is the check result normal? YES : Go to Step 7. NO : Replace the clock spring. STEP 7. Check the wiring harness between C-312 • Check the wiring harness for open circuit and short circuit. Q: Is the check result normal? YES : Go to Step 8. NO : Repair the wiring harness. STEP 8. Retest the system Q: Is the check result normal? YES : The trouble can be an intermittent malfunction (Refer to GROUP 00 − How to use Troubleshooting/inspection Service − How to Cope with Intermittent Malfunction ). NO : Replace the steering wheel voice control Inspection Procedure 7: Voice guide "Unable to obtain vehicle speed. Please try again or contact your CAUTION Before replacing the hands free ECU, ensure that the power supply circuit, the earth circuit and the player> or multivision display <vehicles with MMCS> PROBABLE CAUSES • The hands free ECU may be defective. • The radio and CD player may be defective. <vehicles with radio and CD player> |